Draw-gear and buffing apparatus.



No. 740,429.5 R PATRN'TRD 001.6, 190s.'

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'NoQ 740,429.;

PATENTBDOGT. 6, -190Bf E. M.' HERR. DRAW GEAR AND BUPPING APPARATUS.

-APPLIU'AJIOISI FILED FEB. 7. 1902..

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E. M. HERR. l DRAW GEAR AND BUPFING ANAH-MUS.

3 SHEETS-SHEET i" APPLICATION FILED FEB.` 7| 1902.

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UNITED STATES *facetten october e, i90/. l PATENT OFFICE. i

EDWIN M. HERR, OF PJTTSBURG, PENNSYLVANIA, ASSIGNOR TO THE WEST-INGHOUSE AIR BRAKE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

DRAW-GEAR AND BIUFFING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 740,429, dated October6, 1903.

Application tiled February 7, 1902. Serial No. 93,054. CNO modell:

To all whom, t may concern,.-

Be it known that I, EDWIN M. HERR, a citizen of the United States,residing in Pittsburg, county of Allegheny, State of Pennsyl- Vania,have invented or discovered certain new and useful Improvements inDraw-Gear and Buing Apparatus, of which improvement the following isaspecification.

This invention relatesto railway draft ap- .l o pliances forresistin gand taking up the shocksV liminary or initial spring resistanceelement"4 which will check the first part of the draw;4 bar movement andbe subjected to strain in' advance of the main resistance element, towhich the force of the greater strains istransmitted through themovement of. the, friction-blocks. i v Another object of the inventionis to provide such an apparatus with an additional frictional deviceoperated by the preliminarymovement of the draw-bar.

A further object of the invention is to pro- 'vide means foi` clampingthe housing and friction-blocks together during the preliminary movementof the draw-bar.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a vertical horizontal sectionof my improvement, taken on thelinea: fr of Figs. 2 and 3. Fig. 2 is ahorizontal section taken on the line w w of Fig. 3. Fig. 3 is atransverse section taken on the line y fy of Figs. 1 and 2. Fig. 4 is atransverse section taken on the line z z of Figs. 1 and 2, thedraft-siils being omitted. Fig. 5 is a horizontal section showin g amodified form of my improvement. Fig.'

` 'so 6 is a transverse section taken on the linee u of Fig. 5, theecnter wedge-blockbeing removed. Fig. 7 is a detail view showing one `ofthe center wedge-blocks. Fig. S is a vertical longitudinal section ofthe form of gear illustrated in Fig. 5, but shows a modifiedconstruction of the preliminary resistancespring; and Fig. 9 is atransverse section taken on the line't t of Fig. 8.

The construction shown on Sheet 1 of the drawings will now he described.

The numeral 1 denotes 'the' sills or drafttimbers of car-frame to whichmy improved draw-gear and bufng apparatus may be secured in anydesirable manner. As shown in the drawings, the draft-lugs 2 and 3 aresecured in pairs to the sills, and the connecting-plate 4 is provided tosupport the drawgear. The draw-bar 5 has the usual strap 6 attachedthereto and extending aroundthe follower-plates 7 and 8. Between thefollowerplates is located the improved friction drawfgear comprising abarrel casting or housing 9, carrying the main yielding resistanceelement or twin spring 10 and the friction-blocks 11, 12, and 13. Thehousing 9 is substantially cylindrical in shape, the exterior beingprovided with a series of longitudinal strengthening-ribs 18 and itsforward end being dared outward on two opposite sides, providingftwoinclined faces 14 and 15, which cooperate with the corresponding facesof the triangular-shaped friction-blocks 11 and 12, respectively.Secured on the outside of the barrel casting or housing 9- andpreferably cast integral therewith are the hollow cylindricalprojections 16, preferably four in number, arranged at the four oppositecorners, as shown, and containing the preliminary resistance-springs 19land plungers 20, which extend out of the ends ofV said cylinders andengage the follower-'plate 8. In the upper and lower inner faces oftheared end of the housing containing the frictionblocks are arrangedthe recesses 21, in which are located the wedge-blocks 22 and 23, and g5the rods 17,'having heads 24 at one end thereof engaging the preliminarysprings 19, extend into engagement with the wedge-blocks 22 at theiropposite ends. These wedge-blocks 22 and 23 are located opposite theupper and ico lower faces of the friction-blocks 11 and 12, so as toclamp the said friction-blocks and housing together during thepreliminary movement of the draw-bar and tovncrease the friction betweensaid blocks and hous- Aing during the subsequent movement of thedraw-bar or pressure-transmitting vmember. When the parts are in theirnormal or release position, as shown in the drawings, there is an openspace between the rear end of the housing 9 and the follower-plate 8toallow for an initial movement of the drawbar or pressure transmittingmember and a corresponding preliminary spring resistance beforethere isany material resistance exerted by the main resistance-spring 10 or anyrelative movement of the friction members. There is also a space betweenthe flared end of the housing and the followerplate 7 to allow for thesubsequent movement ofthe d raw-bar in the transmission of greaterstrains when the friction-blocks move into the end of the housing andthe pressure is vtransmitted through them to the main resistance elementor twin spring 10. The operation of this form of my improvedconstruction during the act of pulling is as follows: The initialmovement of the draw-bar and strap or pressure-transmitting memberforces the follower-plate 8 against the plungers 20, compressing thepreliminary springs 19 between said plungers and the heads 24 of therods 17 and clamping the housing to the friction-blocks 1l and l2 bymeans of the wedgeblocks 22 and 23. The faces of these wedgeblocks areso inclined that the housing will alwaysbe clamped to thefriction-blocks during the preliminary movement of the drawbars -anduntil the clearancespace is closed, thus preventing any relativemovementof the friction-blocks during the preliminary movement. Thisinitial or preliminary pressure is resisted by the preliminary springs19, which have a resistance capacity sufficient to check and' take upthe minor strains and shocks to which the device may be subjected. Uponthe application of greater strains and a further movement of thedraw-bar the follower-plate 8 engages the end of the housing 9 andforces the same forward, causing the friction-blocks ll and l2 to movetransversely toward each other and into the housing and by theirinclined faces forcing the center block 13 backward against the mainresistance-spring 10, which thus exerts its action in alinement with themovementl of the drawbar. This subsequent movement is also resisted bythe increased friction between the upper and lower faces ot' thefriction-blocks 1l and 12 and the wedge-blocks 23, which are clampedagainst these faces by the preliminary movement of the draw-bar and theforce of the spring, 19. Although the main resistance-spring lO isslightly compressed during the preliminary movement in which theclearance-space is closed, its resistance to this movement is verysmall, since in this position tion, as shown in the drawings.

it is extended to nearly its full length and nearly all the p reliminarystrain is taken up by the short preliminary resistance-springs 19.

During the operation of bufiing the action of the apparatus issubstantially the same as in pulling except that the pressure from thedraw-bar is imparted to the follower-plate 7, which moves backward,together with the friction-blocks and the housing, there being norelative movement among these parts during the preliminary movement inwhichthe clearance-space is closed. The preliminary Wmovement in buftingclamps the Wedge-blocks 23 against the opposite faces of thefrictionblocks and is checked by the resistance of the springs 19, andthe further or subsequent movement of the buer, due to the greaterstrains, forces the friction-blocks into the housing, compressing themain resistancespring .10, the action being the same as in the case ofdraft strains.

It is to be noted that the friction-blocks are interposed between thedraw-bar or pressuretransmitting memberand the main resistancespring, sothat the greater strain, due to the subsequent movement of the draw-barin both draft and buflng, is transmitted to said main resistance-springthrough the relative movement of the friction-blocks and housing.

According to the modified construction shown in Figs. 5, 6, and 7 twooppositelyarranged housings 25 and 25 are secured to the draft-sills inany desired manner-as, for

IOO

instance, by means of the cheek-plates 27.

rlhe housing 25 contains the follower-plate 28 and wedge-shapedfriction-blocks 29, 30, and 3l, While the housing 25 carries the col'-respondng follower-plate 28' and frictionblocks 29, 30', and 3l. Betweenthe followerplates is located the main resistance-spring 26. The strap 6of the draw-bar 5 extends around the housings and the end wedge--push-rods engage the drawbar 5 and the strap 6, respectively. Lightsprings 34 and 34 are located around the outer ends of the push` rodsand in recesses in the respective wedge- `blocks 3l and 3l', for thepurpose of keeping the inclined friction-surfaces of the wedgeblocksincontact vwith each other a't times when the parts are in normal orrelease posi- The housings are provided with inwardly-flaring walls,which engage the inclined surfaces of the two side wed ge-shapedfriction-blocks as they are lIO forced against the same by the middlewedgei block, which is actuated by the draw-bar, strap, or other pressure-transmitting member. In buiing the initial movement of the drawbar istransmitted directly through push-rod 32 and collar 33 to thepreliminary resistance spring 24. As the draw-bar moves inward thelightspring 34 is compressed into the recess in the wedge-block 31, sothat when the buflng strain is greater than can be resisted by thepreliminary spring 24 the draw-bar then engages the wedge-block 3l,forcing the same between the Wedge-blocks 29 and 30, which movetransversely against the inclined walls of the housing and transmits thepressure.

movement as the friction members enter into action.

In Figs. 8 and 9 I have shown a modified construction of thepreliminary-spring device as applied to the'formof spring-.gear andfriction-blocks illustrated in Fig. 5. The central push-rods andpreliminary spring are dis-l pensed with and in their place twopreliminary springs 39 are located on rods 37, having collars 38 andadapted to actuate the- Wedge clamping-blocks 35 and 3G, which arelocated in recesses in the middle friction-block 31, as shown.

The rods 37 are guided in openings in the draw-bar, and the middlefriction-block 31 is provided with a boss or projection 40 to engage thedraw-bar after the preliminary movement in bufting. During the initialor preliminary movement the wedges 35 and 36 are clamped, thus holdingthe friction-block 3l and the housing 25 rigidly together while thepreliminary springs 39 are compressed. Then upon a further movement, dueto greater buffing strains, the draw-bar engages the projection 40 ofthe middle wedge friction-block 3l and forces the side friction-blocks29 and 30 transversely against the inclined sides of the housing 25 andlineally against the follower-plate 28 and main resistance-spring 26.

The wedge-blocks 35 and 36 are actuated by thepreliminary movement ofthe draw-bar and the compression ofthe springs 39 to give additionalfriction between the housing and the middle block 3l during the furtheror subsequent movement of the draw-bar. The parts are duplicated at theopposite end of the apparatos, as indicated by the primedreferencenumerals, and a similar action takes place in During draftstrains aY resisting draft strains. This construction, therefore,provides not only a preliminary spring-resistance, but also anadditional fric- 4tional resistance, the same as is secured by theconstruction shown in the first sheet of drawings.

Having now described myinvention, what I claim, and desire to secure byLetters Patent, is- 1 l. In a draw-gear or bufingapparatus, th

combination of a draw-bar, a preliminary yielding resistance'element, amain yielding resistance element arranged to exert its action inalinement with the movement of the draw-bar, and friction membersinterposed between said main resistance element and the draw-bar. y

2. In a draw-gear or buiing apparatus, the combination ofa draw-bar, apreliminary spring resistance element, a mainspringre-v lsistanceelement, both of said resistance ele- 4. In a draw-gear orbuiingapparatus, theV combination of a draw-bar, a spring resistance element,friction members interposed between the draw-bar and said springresistance element, anda wedging device adapted to exert pressureagainst the said friction members by the preliminary movement of thedraw-bar.

5. In a draw-gear or bufling apparatus, the combination with a draw-barand a main resistance-spring, of friction members interposed between thedraw-bar and said spring, a preliminary resistance-spring and meansactuated by saidv preliminary spring for increasing the friction of saidmembers.

6. In a draw-gear or bufting apparatus, the combination of a preliminaryspring resistance element, a main spring resistance element arranged toexert its action in alinement with the movement of Ythe draw-bar,friction members interposed between said main resistance element and thedraw-bar, and a housing for said friction members.

7. In a draw-gear or bnfiing apparatus, the combination of a draw-bar, aspring resistance element, friction members interposed between thedraw-'bar and said resistanee'element, a housing for said frictionmembers, and means actuated by the preliminary movement of the draw-barfor increasing the friction between thehousing and said frictionmembers.

8. In a draw-gear or bufting apparatus, the

combination of a draw-bar, a spring resistance element, friction membersinterposed between the draw-bar and said resistance element, a housingforsaid friction members and a wedging device inserted between saidhousing and said friction members and actuated by the preliminarymovement of the draw-bar.

9. In a draw-gear or buing apparatus, the combination of a draw-bar, amain resistancespring, friction members interposed between the draw-barand said spring, a housing for said friction members, a preliminaryresistance-spring and means actuated by said preliminary spring forincreasingthe friction between the housing and the friction members.

10. In a draw-gear or buffing apparatus, the combination of a draw-bar,a main resistancespring, friction -blocks interposedbetween the draw-barand said spring, a housing for said friction-blocks, a preliminaryresistancespring, wedge-blocks adapted to be clamped between the housingand friction-blocks by the preliminary spring during the initialmovement of the draw-bar.

ll. In a draw-gear or bufing apparatus, the combination of a draw-bar, aspring resistance element, friction members interposed between thedraw-bar and said resistance element, a housing for said frictionmembers, and means actuated by the preliminary movement of the draw-barfor clamping said friction members to the housing.

l2. In adraw-gear or buffmg apparatus, the combination of a draw-bar, amain resistancespring, friction members interposed between the draw-barand the said resistance-spring, a housing for said friction members, apreliminary resistance-spring, and a clamping device actuated by saidpreliminary spring for holding the friction members and the housingtogether during the preliminary movement of the draw-bar.I

13. In a draw-gear or bufng apparatus, the combination of a draw-bar, amain resistancespring, friction members interposed between `the draw-barand said spring, a housing for said friction members,preliminaryresistancesprings, wedge-blocks bearing against opposite faces of saidfriction members, and means EDWIN M.V HERR.

Witnesses:

E. A. WRIGHT, R. F. EMERY.

